First off let me note that I DO NOT remember every detail of the manga, so if im wrong somewhere please feel free to correct me. Down to bussiness. The manga has really taken a twist. we have just seen madara uchiha revived by the Impure world ressurection. we all know that you must be dead for this justu to revive you. based on common sense, this proves without a doubt that the masked uchiha(ill just call him tobi) is Not Madara. Some theories:
Obito: No, get off of his nuts please obito is dead. He has no sharingan left(one crushed, one taken by Kakashi.) This uchiha had two sharingan(before he used inzangi).
Inzuna: if i didnt spell it right sorry but its madara uchiha brother. while it could be, i highly doubt it. lets face it too many stories were told of madara taking his brother eyes and his EMS just make it even more proof. i believe he is dead.
Madara: No, why would madara be afriad of himself? many more conflicting factors but im not getting into this.
Sasuke/Itachi's dad?: hmmm could be, but itachi slew him with his own hands. i dont think itachi would have left him alive.
My theory: simple. A uchiha who has yet been introduced. Until futher information is revealed i believe this is a uchiha who might have been envious to madara. he is obviously powerful(even though he hasnt shown any impressive combat experience). What gets me is why has he been alive so long? Also why was he able to perform inzangi? Maybe these two (his age and the use of inzangi)are related? Uchiha and Senju blood?Uzumaki's have long lives and a strong life force so i assume so does the senju. Last but not lease. This is a long shot but im gonna just say it. although we never seen it he HAS MANGEKYO SHARINGAN. If you ever notice when he uses the space time technique, it always comes from his eye. this has to be his mangekyo technique. I could go on and on but i would like to hear others. what do you think?
Well, I think we will actually have to wait to
know more about Tobi. People have started to see
and create associations everywhere but are only
ending up muddying the waters and confusing us
further with their fabricated theories.
i dont think the senju have long lives but cant be
proven. i dont think he is an uchia or he would
turn his sharingun off but he dont or cant like
kakashi. i think he has been adding madara from
the time he left the village. i believe from what
i have seen is that he is a great medical ninja to
transplant eyes and replace arms at will. i also
believe he is the one who cloned zetsu and help
place senju cells in madara. and that he place
uchia and senju cells with in himself. because u
need uchia and senju cells to use izuangi
well thats what it sounded like when i watched the
episode... Suigetsu says, you got inside manda
with a space/time ninjutsu to escape the blast.
and sasuke said just before we flew off manda and
i were hit by the blast. anyways thats not the
point, the point was that sasuke used space-time
ninjutsu before having MS, so its possible tobi
doesnt even have MS
i think that the tobi is obito and this is my
reasoning the mere fact that he only had one eye
exposed the whole time and every time he squared
up against kakashi he always said that kakashi
knows that his jutsus wont work on him and he only
did the space/time jutsu every time to avoid them
if he wasnt a real uchiha he would be tired like
kakashi because the sharingan needs an uchiha body
to work more effectively they only showed that he
had another sharingan after the danzo/sasuke fight
which could mean he transplanted one
if you wana counter with
then why didnt he recognize or tell kakashi that
he was obito, could be the fact that they might
have used the same technique that sasori used on
kabuto and yuura.
use space/time jutsu he summoned manda and
suigetsu used the scroll to summon him back to
their dimension like when orochimaru attacked
konoha village the sand shinobi used the scrolls
to summon the snakes.